JP7164250B2 - 焼結磁石の製造方法 - Google Patents
焼結磁石の製造方法 Download PDFInfo
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Description
本出願は、2019年10月16日付の韓国特許出願第10-2019-0128749号に基づく優先権の利益を主張し、当該韓国特許出願の文献に開示されたすべての内容は本明細書の一部として含まれる。
HC=a+b/D(HC:磁気モーメント、aおよびb:定数、D:結晶粒の大きさ)
前記数式1によれば、焼結磁石の保磁力は、結晶粒の大きさが大きくなるほど減少する傾向を示す。付け加えれば、焼結中に結晶粒成長(初期粉末サイズの1.5倍以上)および異常結晶粒成長(一般の結晶粒サイズの2倍のサイズ以上)が起こり、初期粉末が有し得る理論保磁力より著しく減少する。
以後、前記共晶合金用混合物を冷間等方圧加圧法(Cold Isostatic Pressing、CIP)で加圧することができる。
まず、還元-拡散方法でR-Fe-B系磁石粉末を製造する段階について説明する。還元-拡散法によるR-Fe-B系磁石粉末の製造は、原料物質から合成する段階および洗浄段階を含む。
希土類水素化物粉末は、前記混合粉末対比4~10wt%混合されることが好ましい。
Nd2O3 14g、Fe26.1g、Cu0.04g、Co1.2g、B0.44g、Al0.12g、MoS2 0.2gを、Ca7.5gおよびMg0.6gと均一に混合して混合物を製造する。
Nd2O3 14g、Fe26.1g、Cu0.04g、Co1.2g、B0.44g、Al0.12g、WS2 0.16gを、Ca7.5gおよびMg0.6gと均一に混合して混合物を製造する。以後、実施例1と同様の方法で焼結磁石を製造した。
磁石粉末を製造する過程で、磁石粉末原材料に耐火金属硫化物を添加せずに磁石粉末を製造し、焼結を進行させたことを除き、実施例1と同一の原料に対して、実施例1と同様の方法で焼結磁石を製造した。
実施例1と同様の方法で焼結磁石を製造した後に、次のような溶浸(Infiltration)処理を追加した。
実施例2と同様の方法で焼結磁石を製造した後に、実施例3で説明した溶浸(Infiltration)処理を追加した。
比較例1、実施例1および実施例2によりそれぞれ製造された焼結磁石の保磁力と磁束密度を測定して図1に示している。
比較例1により製造された焼結磁石に対する走査電子顕微鏡イメージを図4に示しており、実施例1により製造された焼結磁石に対する走査電子顕微鏡イメージを図5に示しており、実施例2により製造された焼結磁石に対する走査電子顕微鏡イメージを図6に示している。
Claims (11)
- 還元-拡散方法によりR-T-B系磁石粉末を製造する段階、および
前記R-T-B系磁石粉末を焼結する段階を含み、
前記Rは希土類元素であり、前記Tは遷移金属であり、
前記磁石粉末を製造する段階は、R-T-B系原料に耐火金属(Refractory metal)硫化物粉末を添加する段階を含み、
前記磁石粉末を製造する段階で、前記耐火金属硫化物は、還元されて高融点金属析出物を形成する、焼結磁石の製造方法。 - 前記磁石粉末を焼結する段階で、前記高融点金属析出物が存在する状態で前記磁石粉末を焼結する、請求項1に記載の焼結磁石の製造方法。
- 前記磁石粉末を焼結する段階は、前記磁石粉末に希土類水素化物粉末を添加する段階を含む、請求項1または2に記載の焼結磁石の製造方法。
- 前記希土類水素化物粉末は、NdH2、PrH2、DyH2およびTbH2のうちの少なくとも1つを含む、請求項3に記載の焼結磁石の製造方法。
- Pr、Al、CuおよびGaを含む共晶合金(Eutectic alloy)を製造する段階、および
前記共晶合金を前記焼結磁石に溶浸(Infiltration)処理する段階をさらに含む、請求項1から4のいずれか一項に記載の焼結磁石の製造方法。 - 前記溶浸処理する段階は、前記共晶合金を前記焼結磁石に塗布する段階、および前記共晶合金が塗布された焼結磁石を熱処理する段階を含む、請求項5に記載の焼結磁石の製造方法。
- 前記共晶合金を製造する段階は、
PrH2、Al、CuおよびGaを混合して共晶合金用混合物を製造する段階、前記共晶合金用混合物を冷間等方圧加圧法で加圧する段階、および前記加圧した共晶合金用混合物を加熱する段階を含む、請求項6に記載の焼結磁石の製造方法。 - 前記R-T-B系磁石粉末を製造する段階は、希土類酸化物、鉄、ホウ素および還元剤を混合した後に加熱する段階を含む、請求項1から7のいずれか一項に記載の焼結磁石の製造方法。
- 前記還元剤は、Ca、CaH2およびMgのうちの少なくとも1つを含む、請求項8に記載の焼結磁石の製造方法。
- 前記R-T-B系磁石粉末は、前記RがNd、Pr、DyまたはTbであり、TはFeである磁石粉末を含む、請求項1から9のいずれか一項に記載の焼結磁石の製造方法。
- 前記耐火金属硫化物粉末は、MoS2およびWS2のうちの少なくとも1つを含む、請求項1から10のいずれか一項に記載の焼結磁石の製造方法。
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